Why not use Squarespace's built-in forms?

Built-in forms have limited fields, no webhook integrations, no Slack notifications, and basic spam protection. FormsList gives you all of these.

Do I need a Business plan?

Yes. Code Blocks require Squarespace Business plan or higher.

Can I avoid page redirects?

Yes. Add JavaScript to intercept the submit event and use fetch() to POST to FormsList, keeping users on the same page.

Beginner4 min readUpdated Mar 27, 2026

How to Add a Custom Form to Squarespace (Beyond Built-in Forms)

Add a custom form to Squarespace using a Code Block and FormsList.

TL;DR

Squarespace's built-in forms are limited. Add a custom form using a Code Block with HTML that submits to a FormsList endpoint. Get spam protection, email notifications, and integrations that Squarespace forms don't offer.

By Vaibhav Jain·Published March 27, 2026

Prerequisites

Squarespace site (Business plan)
FormsList account (free)

Create a FormsList endpoint

Add a Code Block

In Squarespace, edit page > Add Block > Code. Paste this HTML.

<form action="https://formslist.com/f/YOUR_HASH" method="POST" style="max-width:500px">
  <label>Name</label>
  <input type="text" name="name" required style="width:100%;padding:10px;margin-bottom:12px;border:1px solid #ccc;border-radius:4px" />
  <label>Email</label>
  <input type="email" name="email" required style="width:100%;padding:10px;margin-bottom:12px;border:1px solid #ccc;border-radius:4px" />
  <label>Message</label>
  <textarea name="message" rows="5" required style="width:100%;padding:10px;margin-bottom:12px;border:1px solid #ccc;border-radius:4px"></textarea>
  <button type="submit" style="background:#000;color:#fff;padding:12px 32px;border:none;border-radius:4px;cursor:pointer;width:100%">Send</button>
</form>

Style to match your site

Adjust colors, fonts, and spacing to match your Squarespace theme.

Test

Preview, submit a test form, and verify in your FormsList dashboard.

Frequently Asked Questions

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Ready to collect form submissions?

200 free submissions a month and a live endpoint in 30 seconds. No server, no credit card, just point your form at it.